QWERTY Embedded Design, LLC
LoFive is a lightweight SiFive Freedom E310 open source SoC evaluation kit. The E310 leverages the Free and Open RISC-V Instruction Set Architecture originally developed by UC Berkeley and now has wide industry support via the RISC-V Foundation. Don't let the board's understated name and openness fool you - this MCU packs some impressive specs and the board was designed by the prolific QWERTY Embedded Design founder, Michael Welling.
This group buy will be used to fund the first batch and seed the community with a new RISC-V based microcontroller board.
Not available / campaign funded, end date: Sat, 07 Oct 2017 16:59:00 PDT
3-5 weeks after close of campaign. Days
FTDI Breakout used for programming the LoFive. ![Image of TDI FT2232H-56Q MINI MDL](https://groupgets-files.s3.amazonaws.com/LoFive/FT2232H-56Q_MINI%20MDL.PNG)
20x3" (7.62cm) Female to Male Jumper Wires. ![Female to Male Jumper Wire Image](https://groupgets-files.s3.amazonaws.com/LoFive/lf1.jpg)
20x3" (7.62cm) Male to Male Jumper Wires. ![Male to Male Jumper Wire Image](https://groupgets-files.s3.amazonaws.com/LoFive/lf2.jpg)
20x3" (7.62cm) Female to Female Jumper Wires. ![Female to Female Jumper Wire Image](https://groupgets-files.s3.amazonaws.com/LoFive/lf3.jpg)
This is a 'full-size' breadboard, 830 tie points. Good for small and medium projects. It's 2.2" x 7" (5.5 cm x 17 cm) with a standard double-strip in the middle and two power rails on both sides. The back is made of foam double-sided tape, if you remove the protective paper you can attach it to a flat clean surface. ![Breadboard Image](https://groupgets-files.s3.amazonaws.com/LoFive/lf4.jpg)
Diffused 5mm tri-color LEDs with separate red, green and blue LED chips inside! * Pack of 25 diffused RGB LEDs * 5mm diameter * Red: 630 nm wavelength, Green: 525 nm, Blue: 460 nm * Red: 1.9-2.3V Forward Voltage, at 20mA current, Green: 3.0-3.4V, Blue: 3.0-3.4V * Red: 3000 mcd typical brightness, Green: 5000 mcd, Blue: 900 mcd ![LED Image](https://groupgets-files.s3.amazonaws.com/LoFive/lf5.jpg)
Another creative overseas shipping option may be to use "shipito" to send this board and items from other US sites to reduce overall shipping costs: https://www.shipito.com/en/. We used to have cheaper overseas shipping options but we had a high rate of loss of expensive items. We are re-evaluating our current stance for lower cost items going forward but unfortunately we won't have a solution implemented for this campaign.
I ordered some in this campaign, but now I have one already! Photo taken at an airport gate at SFO, on my way back to Moscow. I didn't get a chance to try it yet (just arrived home). https://pbs.twimg.com/media/DMDeaemVAAAIW4g.jpg
Test panel passed validation - moving forward with full the production run! https://twitter.com/groupgetscom/status/925894588820111360
The on-board flash is programmed via JTAG and a special version of OpenOCD built into the Freedom-E SDK.
LoFive currently support using the FT2232H-56Q FTDI breakout adapter.
Wire the breakout adapter as follows:
LoFive Pin FT2232H-56Q Breakout Pin
This will power the board and allow you to program it with an updated Freedom-E SDK.
The Freedom-E SDK version that is ported for LoFive is here:
Once the SDK is installed and compiled you can load the code via make upload.
For instance to load the LED demo:
make upload PROGRAM=led_fade BOARD=freedom-e300-lofive
This SDK only supports running on Linux.
For my own reference, the FT2232H-56Q FTDI breakout adapter can be found:
Here's a link for DigiKey's page if others would rather buy from them.
Is this just using SPI, I'm wondering what other programmers may work or whether there is something very specific to the mentioned board. I can appreciate if you only want to support folks who are using the programmer you have, cuts down possibilities. It would be nice to know, though. I'm getting two boards so can do comaparitive testing on programmers. Might try the Adafruit single channel FT232H https://www.adafruit.com/product/2264Post last edited: over 2 years ago
We have begun shipping LoFives! Wiki for development here: https://github.com/mwelling/lofive/wiki